There are different VAST-compliant video players on the market. In this demo, we use VideoJS. From our example video integration code, you can make changes to different video settings, including the location of your main content video, poster/thumbnail. Video JS with IMA plugin supports VAST or VMAP so you can display multiple ads (pre-roll, mid-roll, post-roll) for each main video. For example: a pre-roll ad and another post-roll ad for the same video.